Weighing machine



Oct. 20, 1953 A. WIRTH WEIGHING MACHINE 2 Sheets-Sheet 1 Filed Feb. 6, 1950 Oct. 20, 1953 A. WIRTH WEIGHING MACHINE 2 Sheets-Sheet 2 Filed Feb. 6, 1950 Patented Oct. 20, 1953 2,656,175 WEIGHING MACHINE. sr w ul, Ziurich, Switzerland Application February 6, 1950, Serial No. 142,551 In Germany February 8, 1949;"

4, c u (o1. ass-5e 5 Thi n e o re te m, a weighin ma h n of, the type having a load supporting levei j systern, an indicator device and a connecting mem er c n said etter. system it t e. iater de T e p al bj ct hf.v he vent on. is 9, p ovi e a wei in ma ne. fthh type ndic te above which may readily be converted from we h n w t out a ar we h to we in i tareweieht- An ther object f th i vent on s to vi e n said mem e nn t n t e ev r sys m withh n ica o d v se {11 Wk? me ber e ehee o. cooperate wit a beam whi s ulrumsd, t xe a t of. the mach ne a PW- sed w a m a le We ght the movements hi which change the setting of the indicator device.

A. t neir Object o th hvehtihh s t mvi s a d beam With an x ens n carrying. unt r we t t m n e o h nc e e ihei load on the lever system in tare weighing.

t f bj t and d a ag s of} 3 n en ion. W l h app e t from e llow es r pt on with re -hm to e ec hm ah ihe d w ngs inwhich:

Rig. 1 is an elevation of a part oi a weighing machi e hh h mh ih m e per i the frame of the'weighing machine, said column being shown in vertical cross-section,

2' a similaryiew of a modified embody z,

ment of the invention, and

Figs. 3 and 4 are detailed views of the embodiment shown in Fig.2.

I n'Fi'g'f2 a tension rod indicated merely by a center line I extends upwards from alever sy tem (not shown) located under a weighing'plat f rm (not shown) at thebotto'm c'fah ilbw column 2 forming part ofthe frame; of ore Weighing'machine'. The upper end of the tension red I; is connected with an indicator device (not shown) and in a well known manner-the arrangement is such that the tension rod I tends to pull the platform upwards, thus to move the icethr to e negative. sid Qt the em ma T-hc'olumn 2 is provided with two"oppositely disposed openings 3. '4, and a bracket35 is secured to the outside of the column 2 below, the qheh 'h i b mea s screwsii- Said hiehhe it c rri s two ea s r n s?! 2? ch exte pwa d f m h b a ke 5 a d at sis h end ha r llow bl cks a R espect yhi P ow h hc s I and" i e s rewe at e d 2 re pectively in; me rs item 31 whic a e secured 9 th lee: s an 22, respectively, by means of screws 38. Adjustht c ews. 2 24 a e in h ad d enga emen Wi h h h ki a f ee hht 2 1 springs 2| and 22, respectively, thus 'plio x a means for lateral adjustment of the'loc of the pillow, blocks 13a idi-3b; e The adjustment screws 23, 24 can be l'oc d in desired positionby f i Of 1 k nu s ,9 and 1 respectively.

A beam I4 extends through the openings 3, and iand supported on the pillow stone l 3 aj I3b by means of knifeedgesl [4b secured to said. beam I4. Thegbeam'llalso eitends through e yoke 1 and is provided with another knife e I la disposedin'rever sed d ifi tion in relat H I" the knife edges Mb. This knife 'edgieflla is 1n engagement with a reyersedpillowj61901515 S ured to hhf h s .ehilt is cmw and nu 5 I H t A weight is carried by one arm of the (while anothersmaller w'e'ightdfi isc by the othr arm of, the beam" I'4.' Brack' III are secured to the outside of; theeol' and providedwith recessesIor guide IQQv v and 5|, respeetively, intdwhicnthe' nds or the beam I I' exte'ndl Apertured covers 511, 6d 1 31? removably attached to the brackets [8 ai'ifd II. resp ctiv ly ot' t e ohhh h id4, r schedt vely H I This embodiment of. the invention is, primarily intended for u n ta wei h ng? W'h h 15 weight is placed on the platform of the we gh g machine, it is obvious that it will cause the nd cator to show increased weight by pulling the tension red I, downwardsl moving the weight I5 to a ro ei'positicn on the beam [4 t is n nc t wa d d nwar lhhv meht 6f h tension rod I can be counteractedjand preferably s. d ent is ca rie h e mi wh re he in ic t a n occup es a s ti os th t e z o ma i t e ndi a devic 'Eih l a iu ment t po itio the indicatgr e ac l 9 1 the er m k h n e fe ed: y. movement o he m ller. wei t '6 n. the; ro er d feqt oh 9 the b iou y this. emhqd m n o my invention can be used also for tareless weighing by proper adju t nt oithe wei hts is and, 16, i. eQby movin t e weight. I fa to t e eft on i s support n arm and ad u t n th ei ht IE. t properly counteract the upward force on theyoke' -li 'However, the equipment is unnecessarily complicated and expensive for tarele-ss weighing and, in cases'where the machine is to be" used ex= clusively for such tareless weighing," 1. "thhrefore, prefer to replace some of this equipment with a simpler and less expensive mechanism of basically the same function. An example hereof is shown in Fig. 1, wherein identical parts bear the same reference marks as in Figs. 2-4.

The yoke l is provided with a lateral bracket 8 which is secured to the yoke by means of the screw and nut 52 and connected with one end of a beam it by means of a link 39. The other end of the beam it is provided with a hook 3| by means of which the beam in is carried in a bracket a secured to the inside of the hollow column 2. The beam 55 carries a weight H.

The two oppositely disposed openings and 3 are closed by removable covers and respectively. l'he cover 6 is provided with an aperture 32 and through this aperture 32 a rod 3a extends which is screw threaded into the end of the beam it and provided with a knob !2 on its free end.

The arrangement of the beam as, the weight i l and the screw i2 is such that when the screw i2 is screwed as far into the beam if! as possible, the indicator in th indicator device occupies a position at the positive side of the zero mark. Accordingly, it is obvious that by turning the knob l2 in a direction to move the screw 3a, 22 out from its innermost position in the beam iii, the weight of the knob I?! will, to an increasing extent, counteract the action of the weight 5! and move the indicator towards or past the zero Thus, it is possible, by proper adjustment of the screw 4a. 52, to place the indicator exactly on the zero mark in the indicator device.

In converting the embodiment shown in Fig. 1 to the tare weighing embodiment of Figs. 2 to 4, the screw 5a, 22 is removed and also the covers 5 and 6. The beam i6 is then unhooked from the brackets 8 and 9 and removed through one of the openings 4. The nut 52 is unscrewed and the bracket 8 removed and replaced by the pillow block 55. The bracket with the pillow blocks i3a, E32), is secured to the column and the beam i is inserted through the openings E: and 5 and through the yoke "I and placed in proper position with the knife edges 55a and i i-b in engagement with their respective pillow blocks. The brackets l? and 18, together with the apertured covers 6a and 5a, respectively, are then secured to the column and the weig -ts i5 and is are adjusted as indicated above. Conversion embodiment of Figs. 2 to 4 into the embodiment of Fig. l is, of course, a reversal of this procedure.

It is obvious, therefore, that I have provided a wei hing machine which may readily be converted from weighing without tare to weighing with tare, or vice versa, through exchange of a few parts only. The above description of a pref rred form of the invention is not intended as a limitation on the details and dimensions described and illustrated except as provided for in the following claims, since obvious modifications will occur to a person skilled in the art.

What I claim is:

l. in a weighing machine of the type having a load supporting lever system and an indicator device with a member connecting said lever system with said indicator device, a yoke in said connecting member, a support member, a beam extending through said yoke, a first knife edge on said beam transversely thereof, a pillow block on said support member in engagement with said knife edge, a second knife edge on said beam parallel with said first knife edge, a pillow block in said yoke in engagement with said second knife edge, a weight on said beam exercising a downward force on said yoke, means on said beam for counteracting said downward force, and means for adjusting the effect of said counteracting means.

2. In a weighing machine of the type having a load supporting lever system and an indicator device with a member connecting said lever system with said indicator device, a yoke in said connecting member, a support member, a beam extending through said yoke, a first knife edge on said beam transversely thereof, a pillow block on said support member in engagement with said knife edge, a second knife edge on said beam parallel with said first knife edge, a pillow block in said yoke in engagement with said sec- 0nd knife edge, a first weight on said beam at the opposite side of said second knife edge from said first knife edge, means for adjusting the position of said first weight longitudinally of said beam, a counterweight on said beam at the opposite side of said knife edges from said first weight, and means for adjusting the position of said counterweight longitudinally of said beam.

3. In a weighing machine of the type having a load supporting lever system and an indicator device with a member connecting said lever sysem with said indicator device, a yoke in said connecting member, a support member, a beam extending through said yoke, a first knife edge on said beam transversely thereof, a pillow block on said support member in engagement with said knife edge, a second knife edge on said beam parallel with said first knife edge, a pillow block in said yoke in engagement with said second knife edge, a first weight on said beam at the opposite side of said second knife edge from said first knife edge, means for adjusting the position of said first weight longitudinally of said beam, a counterweight on said beam at the opposite side of said knife edges from said first weight, means for adjusting the position of said counterweight longitudinally of said beam, guide brackets secured to said support member, and vertically extending guide grooves in said guide brackets for receiving and guiding the ends of said beam.

4. A weighing machine as set forth in claim 3, in which said support member comprises a fixed hollow column, a bracket secured to said column, a cantilever type leaf spring secured to said bracket and extending upwards therefrom in a plane perpendicular to said beam, said first pillow block being secured to the upper end of said leaf spring, and means for adjusting said leaf spring in a direction longitudinal of said beam.

AR-M'IN WIRTH.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,295,967 Buckingham Mar. 4, 1919 1,504,555 Hapgood Aug. 12, 1924 1,626,961 Osgood May 3, 1927 1,870,233 Bryce Aug. 9, 1932 1,988,655 Hamblin Jan. 22, 1935 2,285,927 Hem June 9, 1942 2,456,178 Dimick Dec. 14, 1948 

